fix: pass API keys through settings snapshot

scripts/ldr-diff-research.py

@@ -74,6 +74,14 @@ def main():
         if model_name:
             overrides["llm.model"] = model_name
 
+        # Add API keys from environment
+        if os.environ.get("OPENROUTER_API_KEY"):
+            overrides["llm.openrouter.api_key"] = os.environ[
+                "OPENROUTER_API_KEY"
+            ]
+        if os.environ.get("SERPER_API_KEY"):
+            overrides["search.serper.api_key"] = os.environ["SERPER_API_KEY"]
+
         settings = create_settings_snapshot(overrides=overrides)
 
         # Build kwargs